OTHER-2022-036-Stormwater operations and maintenance plan agreement

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Table 1 : Inspection and Maintenance Provisions for Wet Pond Jill 1 ! i ; l Upon • Watering is needed twice a week until the plants on the vegetated shelf and completion of perimeter of the basin become established ( commonly &8 weeks ) , depending construction on rainfall . • Mow grass surface areas to a height of approximately six to eight inches and remove grass clippings . • Check inlet system/forebay and outlet device for any obstructions or clogging . Once a quarter Remove accumulated grit, leaves , and debris and dispose off-site . • Remove any trash within the pond area . • Inspect for ponding and bare or eroding areas and make adjustments before the next rainfall as necessary . Twice during the growing • Pull out dead or diseased plants, weeds, or invasives preferably by hand . season • Have the embankment inspected by a dam safety expert . • Remove woody species on or near embankment area and maintenance access . Annually A dam safety specialist should be consulted to remove any trees . • Prune trees and shrubs to best professional practice . Thin vegetation so that sunlight can penetrate the pond surface . Vegetation • If the wet pond suffers from dead or diseased plants or overgrown with invasive species, evaluate the source of the problem : soils , hydrology, species, and/or type of disease to determine the cause of the plant failure . o Remediate the problem by selecting new species and/or implementing an eradication plan for invasives . o Ensure appropriate plant maintenance is occurring . o A one -time fertilizer application to establish ground cover is permissible As needed if a soil test indicates it is necessary . No portion of the wet pond system (Typical shall be fertilized after the initial fertilization that is required to establish Problems ) the vegetation . o Consult with the Town of Chapel Hill Stormwater Management Division If algal growth covers 50 % of the area , consult a professional to remove and control the algal growth . • If cattails , phragmites, or other invasive plants exceed 50 % of the wet pond , remove invasives by physical removal or wiping them with a herbicide . Consult the Town of Chapel Hill before any aquatic herbicide is used . Site specific approval is required . Extended periods of dewatering may be a possible treatment approach for reducing invasives .